Blood RNA marker linked to death risk in older hospital patients
A 10-year observational study of 648 hospitalized adults aged 65 or older linked higher levels of one small RNA molecule to higher mortality.
Limit: The findings may not apply to older adults who are not hospitalized
Edited by Boris Djordjevic · AgingResearch.News
In 648 hospitalized adults aged 65 or older, researchers conducted a prospective observational study of four blood microRNAs, small RNA molecules that help regulate gene activity. They measured levels at enrollment and tracked deaths from any cause over 10 years. During follow-up, 525 participants died.
Participants in the highest third of miR-483-5p levels had higher mortality than those in the lowest third. The association remained after researchers accounted for demographic characteristics and multiple measures of health, including kidney function and inflammation. It also held when they excluded people with chronic kidney disease. Adding this microRNA to models modestly improved their ability to distinguish mortality risk at early and intermediate follow-up.
Why it matters
The authors suggest that this blood marker may reflect biological vulnerability in late life, which chronological age and standard clinical measures incompletely capture.
Caveats
This observational study cannot show that the RNA molecule caused higher mortality. The findings may not apply to younger people or older adults who are not hospitalized.
The paper
Circulating miR-483-5p predicts long term all-cause mortality in hospitalized older adults
Marche Polytechnic University
Mechanisms of Ageing and Development, May 5, 2026, Open access
